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... sexually reversed hen will try to mate with other hens in the flock. It is however, unknown whether a hen that has undergone a spontaneous sex reversal and developed an ovotestis can sire offspring... http://www.urbanchickenpodcast.com/ucp-episode-018/ I personally saw hen laying ...

"Some species, such as some snails, practice sex change: adults start out male, then become female (See also sex reversal). In tropical clown fish, the dominant individual in a group becomes female while the other ones are male, and bluehead wrasses (Thalassoma bifasciatum) are ...

... I can't think of any evidence that suggests that survival traits are lost in genes. In the case you mention of plants bred to be resistant, their reversal to an older type in the absence of the threat is a simple reversion to a 'setting' which is quite recent. If we carried antibodies to every ...

... become incapable of doing full time physical work. Today people have become incapable of even walking - they need a car to go a short distance. Reversal is not possible - there is not enough land for all people to plough. And if we continue with the present city based lifestyle we will continue ...